java对pdf关键字定位

来源：互联网发布：淘宝宝贝浏览量怎么看编辑：程序博客网时间：2024/06/05 15:28

昨天研究一天的对pdf关键字定位，走了不少弯路，网上找的好多有瑕疵，今天有时间跟大家分享下：

以下方法是对pdf每页内容进行扫描定位出关键字的大致坐标。

import com.google.common.collect.Lists;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.AcroFields.FieldPosition;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.parser.ImageRenderInfo;
import com.itextpdf.text.pdf.parser.PdfReaderContentParser;
import com.itextpdf.text.pdf.parser.RenderListener;
import com.itextpdf.text.pdf.parser.TextRenderInfo;

// 定义返回页码
   private static int i = 0;
   private static com.itextpdf.awt.geom.Rectangle2D.Float boundingRectange =null;

   private static StringBuilder content;

   private static List<Object[]> arrays = Lists.newArrayList();

private static List<Object[]> getKeyWords(String filePath, final String keyWord) {

       try {
           PdfReader pdfReader = new PdfReader(filePath);
           int pageNum = pdfReader.getNumberOfPages();
           PdfReaderContentParser pdfReaderContentParser = new PdfReaderContentParser(pdfReader);

           for (i = 1; i < pageNum; i++) {
               content = new StringBuilder();
               boundingRectange =new com.itextpdf.awt.geom.Rectangle2D.Float();
               pdfReaderContentParser.processContent(i, new RenderListener() {
                   @Override
                   public void renderText(TextRenderInfo textRenderInfo) {
                       String text = textRenderInfo.getText(); // 整页内容
                       content.append(text);

                       boundingRectange= textRenderInfo.getBaseline().getBoundingRectange();
                       /*if (null != text && StringUtils.contains(content, keyWord)) {
                           float[] resu = new float[3];
                           resu[0] = boundingRectange.x;
                           resu[1] = boundingRectange.y;
                           resu[2] = i;
                           arrays.add(resu);
                       }*/
                   }

                   @Override
                   public void renderImage(ImageRenderInfo arg0) {
                       // TODO Auto-generated method stub

                   }

                   @Override
                   public void endTextBlock() {
                       // TODO Auto-generated method stub

                   }

                   @Override
                   public void beginTextBlock() {
                       // TODO Auto-generated method stub

                   }
               });

               if (null != content && StringUtils.contains(content, keyWord)) {
                   Object[] resu = new Object[4];
                   resu[0] = content;
                   resu[1] = boundingRectange.x;
                   resu[2] = boundingRectange.y;
                   resu[3] = i;
                   arrays.add(resu);
               }

               //   System.out.println("第"+i+"页，内容："+content);
           }


       } catch (IOException e) {
           e.printStackTrace();
       }
       return arrays;
   }

以上方法中使用到的jar包

itextpdf-5.5.6.jar

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